﻿// bsn ModuleStore database versioning
// -----------------------------------
// 
// Copyright 2010 by Arsène von Wyss - avw@gmx.ch
// 
// Development has been supported by Sirius Technologies AG, Basel
// 
// Source:
// 
// https://bsn-modulestore.googlecode.com/hg/
// 
// License:
// 
// The library is distributed under the GNU Lesser General Public License:
// http://www.gnu.org/licenses/lgpl.html
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;

namespace bsn.ModuleStore.Sql.Script {
	public abstract class ForXmlClause: ForClause {
		private readonly List<XmlDirective> directives;
		private readonly StringLiteral elementName;

		protected ForXmlClause(StringLiteral elementName, Sequence<XmlDirective> directives) {
			this.directives = directives.ToList();
			this.elementName = elementName;
		}

		public IEnumerable<XmlDirective> Directives {
			get {
				return directives;
			}
		}

		public StringLiteral ElementName {
			get {
				return elementName;
			}
		}

		public abstract ForXmlKind Kind {
			get;
		}

		public override SelectFor SelectFor {
			get {
				return SelectFor.Xml;
			}
		}

		protected abstract String KindSpecifier {
			get;
		}

		public override void WriteTo(SqlWriter writer) {
			writer.WriteKeyword("FOR XML ");
			writer.WriteKeyword(KindSpecifier);
			if (elementName != null) {
				writer.Write(" (");
				writer.WriteScript(elementName, WhitespacePadding.None);
				writer.Write(')');
			}
			if (directives.Count > 0) {
				writer.Write(", ");
				writer.WriteScriptSequence(directives, WhitespacePadding.None, w => w.Write(", "));
			}
		}
	}
}
